Bolt-cutter.



no. 804,142. PATENTED NOV. 7, 1905-.

v c. K. LASSITER.

BOLT CUTTER.

APPLICATION FILED DBO. 12, 1903.

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V G. K. LASSITBR.

BOLT CUTTER APPLIOATION rILnn D20. 12. 1903.

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C. K. LASSITER.

BOLT CUTTER. APPLICATION 11.31) DBO. 12, 1903.

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NO. 8045142; I PATENTED NOV 7, 1905. C. K. LASSITER. BOLT CUTTER.

APPLICATION FILED 1,110.12, 1903.

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No. 804,142. PATENTBD NOV. 7, 1905.

' G. K. LASSITBR.

BOLT CUTTER.

APPLICATION FILED DBO. 12, 1903.

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UNTTFD STATES ATENT QFFTCE,

BOLT-CUTTER.

Specification of Letters Patent.

Patented Nov. 7, 1905.

Application filed December 12, 1903. Serial No. 184,986.

To (all whorl 1, it may concern:

Be it known that 1, COLUMBUS K. LASSITER, a citizen of the United States, residing at Schenectad y, in the county of Schenectady and State of New York, have invented new and useful Improvements in Bolt-(lutters,of which the following is a specification.

My invention relates to improvements in bolt-cutter heads of that class or kind wherein a holder with a circular seat carrying a cylindrical box, a plurality of segmental space blocks in the box, and adjustable cutters and guides are employed, all as will be more fully hereinafter set forth.

The object of the present invention is to simplify and improve the existing art by producing and providing a new and improved device or machine for cutting and finishing boltblanks which is efficient, certain, and expeditious in operation and readily and conveniently adjusted to suit the size of the bolt or blank.

, It will be premised that while the description will be confined to a single device or cutter'head the heads are to be used in a series of any number desired and utilized by mechanism whereby all the cutters are used simultaneously. It has not been deemed necessary to show the machine which is used in conjunction with a multiple of the heads, since this may be'of any approved make adapted to rotate a spindle for each cutter.

In the drawings annexed hereto and forming a part hereof the same parts appearing in the several illustrations are designated by similar reference-notations.

Referring to the drawings, Figure 1 is a top plan view of the complete device, showing the holder, the cylindrical box, the segmental space-blocks, and the tools and guides arranged therein. Fig. 2 is a bottom plan view of the device, showing the central opening in the bottom plate and the end portions of the tools and guides in aggroupment. Fig.

8 is a horizontal section taken on the line 3 3 of Fig. 4:, showing the arrangement of the parts as in operative assemblage. Fig. 4: is a view in side elevation, partly in longitudinal vertical section, taken on the line 4 4 of Fig. 1, and showing the means for adjusting the cutters. Fig. 5 is a central vertical crosssection, taken on the line 5 5 of Fig. 1, showing the means for adjusting the segmental space-blocks. Fig. 6 is a perspective view of one of the segmental space-blocks. Fig. 7 is a top plan view of a cutter-head fully equipped for attaining the first or preliminary cutting of the bolt. Fig. 8 is a side elevation, partly in transverse and vertical section, taken on the line 8 8 of Fig. 7. Fig. 9 is acentral vertical section through the cutter-head shown by Figs. 1, 2, 3, 1, and 5, showing a plug-jig and plug-gage applied thereto for facilitating the adjustment of the shiftable parts. Fig. 10 is a detail perspective view of the plugjig shown by Fig. 9. Fig. 11 is a central vertical section through the form of cutter-head shown by Figs. 7 and 8, illustrating a plugjig and plug-gage applied thereto. Fig. 12 is a detail perspective view of the plug-jig shown applied in Fig. 11. Fig. 13 is a detail perspective view of one of the space-blocks used in the form of the cutter-head illustrated by Figs. 1, 2, 3, 4, and 5.

A designates the holder-stock or retainingring, consisting of a central broad split ring 1, at the meeting edges of which are formed lugs 2, through which are projected clampingbolts3 to clamp the ring firmly about the box. Diametrically extending from opposite sides of the ring are arms 4: 1, the end portions of which are adapted to be seated on and rest upon any suitable support made on or secured tothe base of a bolt-making machine. At the upper edge of the ring is formed an interior annular shoulder 5, whereon the annular flange of the box rests. The retaining-ringis made broad enough to carry the box firmly against all stress and vibration which might be occasioned during the progress of the work of cutting the bolts.

6 designates the box or backing-rest, consisting of a strong cylindrical shell detachably but snugly fitted in the opening of the retaining-ring, as indicated in the drawings, and formed with an annular flange 7 at its upper end, which flange rests on the shoulder 5 of the retaining-ring and also with a flange 8 to provide an oil-receptacle. To the lower end of the box is secured a substantial metal bottom 9, screws being passed through the bottom into threaded sockets, substantially as indicated in the drawings. Centrally in the plate 9, forming the bottom, is made a circular opening 10, having radial circular clearance-recesses 11 extending into the plate, so that the chips or cuttings may drop down into any receptacle provided to receive them. The bottom plate 9 serves as a seat for the contents of the box and prevents all the material contained in the latter, as well as the cooperating elements, from moving downwardly too far. In the box thus provided are disposed a too plurality of segmental space-blocks 12 13,v

bolts 14:, let through the shell of the box and engaging in screw-threaded sockets entering the backs of the segmental space-blocks 12, substantially as shown, and operating to hold them firmly in the required fixed position. In each side face of the space-blocks 12 is made a vertical socket 15, open at one side through the face of the blocks, and in the bottom of these sockets are made screw-threaded sockets 1.6, in which engage screws 17, having circular heads 18, which project through the side opening of the circular sockets to engage in recesses in the guide-pieces for the cutters, as indicated in the drawings. The segmental space-blocks 13 are disposed in the box alternately to the blocks 12, as best seen in Figs. 1 and 3, and are duplicates in general contour thereto. In the back or outer portion of each of the blocks 13 is made a vertical slot 19, having its end wall at a suitable incline from top to bottom, and in these slots 19 are placed adjusting-pieces 20, having their inner edges reversely inclined to the end walls of the slots they engage, so that the position of the pieces 20 will determine the adjustment of the spaceblocks 13. The inner ends of the space-blocks 13 are formed with suitable clearing-spaces 21 to permit the escape. of the chips or cuttings. To adjust the blocks 13, vertical sockets 22 are made in the wall of the box 6, having vertical slots opening through the inner face of the box, and from the bottoms of the sockets 22 extend screw-threaded sockets 23, wherein engage adjusting-screws 24:, formed with circular heads 25, which project through the vertical openings in the wall of the box and engage in proper recesses 26 in the outer edge of the adjusting-pieces 20, as seen in Fig. 5 of the drawings. The heads of the adj usting-screws 17 and 24 are formed with suitable projections or sockets to take a wrench for making the adjustments.

The fixed space-blocks and the adjustable space-blocks are placed alternately in the box and in cross-section are of such size as to leave radial spaces between them of sufficient width to receive the cutters and the guides and the adjusting-pieces for each, respectively, as indicated in Figs. 1 and 3 of the drawings.

27 designates the cutters, consisting of strong steel blades seating between the spaceblocks and having tapering cutting edges and back edges inclined from top to bottom outward. Behind the cutters are placed adjusting blocks, pieces, or plates 28, having their inner edges inclined reversely to the backs of the cutters and their outer edges vertical and straight to sit against the inner face of the box, as best seen in Fig. 4 of the drawings. In the side face of the adjustingpieces is formed a recess 29, in which the perimetal projecting part of the heads 18 engages. In the spaces between the space-blocks alternate to the cutters are placed the guide-pieces 30, which are adapted to be adjusted to bear with their inner edges against the bolt and hold it properly positioned to stand the cutting action of the cutters. The guide-pieces 30 and their adjusting-pieces 31 are identical in form to the cutters and their adjusting means except that the bearing edges of the guide-pieces are made plain and have no cutting edge.

It will be observed that the space-blocks extend the full length of the cutting blades, which latter correspond in length with the length of the bolt bore or passage, and thus clamp and reinforce the blades to the fullest extent and prevent them from springing or yielding and improperly cutting the bolt and also from chattering at all times while the cutter-head is in use. Owing to the fact that the tapering cutting edges of the cutting-blades form a tapering bolt-passage corresponding to the taper to which the body of the bolt is to be cut, it is essential to adjust the cutting-blades for operation bodily in order that the taper of the bore or passage may be preserved, and for this purpose the sliding wedges, which move longitudinally of said blades, are employed. The use of these wedges obviates the objection to prior adjusting devices, which have heretofore consisted of upper and lower screws acting upon the upper and lower edges of the knives to adjust them to position. It has been impossible with adjusting devices of this kind to adjust the cutting-blades to a nicety of adjustment, as after one screw has been adjusted it is practically impossible to adjust the other screw to the same extent and to preserve the proper tapering arrangement of the cutting edges. This objection my construction effectually obviates.

To arrange and secure the elements in operative position and relation, the fixed or stationary segmental space-blocks 13 are positioned and secured in the box 6 by means of the screws 14 and the adjusting-screws 17, placed in preliminary position with the heads above the upper ends of the blocks. The adjustable space-blocks are then put in position between the stationary blocks'and the adjusting-pieces 28 in their places, with the heads of the adjusting-screws engaged in the recesses in the outer edges. The knives or cutters,

with their adjusting-pieces, are then placed in alternate spaces between the space-blocks. Then the guide-pieces, with their adjustingpieces, are-arranged in position, and then all the loose members may be adjusted to suit, which adjustment being ascertained and accomplished the adjustable space-blocks are &

equal in length to the bore through the jig to avoid bottom projection and permit the cutter-head having the jig therein to be disposed upon a flat rest and maintain the assemblage of the several parts contributing to the convenience of the adjustment of the cutters and guides until the latter have been shifted, as desired. The plug-gage will then be removed, thejig withdrawn, and the cutter-head applied in position for operative use.

Having thus described the invention, what is claimed as new is 1. A cutter-head comprising a holder containing a series of individual segmental blocks arranged to form a bore or bolt-passage and radial slots leading thereto, said blocks being alternately fixed to and free for radial adjustment within the holder, cutters and guidepieces held in the slots between the blocks, the blocks extending the full length of the cutters and guide-pieces, wedges for radially adjusting the adjustable blocks, cutters and guide-pieces, means carried by the holder for moving the wedges acting on the adjustable blocks, and means carried by the fixed blocks for moving the wedges acting on the cutters and guide-pieces.

2. In a bolt-cutter head, a retaining-ring, a box positioned in the retaining-ring, vertical adjusting-screws in the wall of the box at radial points therein, radially-adjustable segmental blocks disposed within the box and formed with central radial slots having inclined ends, adjusting-pieces in the slots engaged by the heads of said screws, stationary segmental space-blocks between the adjustable blocks, vertical adjusting-screws in the sides of the stationary blocks, alternately-placed cutters between said blocks, adjusting-pieces behind the cutters, guide-pieces between alternate blocks,adjusting-pieces behind the guidepieces, all of said adjusting-pieces engaged by the vertical ad justing-screws whereby the cutters and the guides are adjusted radially.

3. In a bolt-cutter head, a retaining-ring, a

cylindrical box disposed within the retainingring and formed with vertical circular seats opening through the inner wall of the box and terminating in screw-threaded sockets,-adjusting-screws in said seats and sockets and having heads projecting through the openings in the wall of the box, adjustable segmental space-blocks formed with vertical slots opening centrally at their backs, vertically-movable adjusting-pieces in said slots and formed with a recess in their outer edge engaged by the projecting portions of the adjustingscrews, stationary segmental space block s alternately between the adjustable blocks, formed with vertical circular seats opening through the side faces of theblock and terminating in vertical screw-threaded sockets, ad-

justing-screws in the sockets having circular heads partly projecting through the vertical opening of said seats, cutters in the alternate spaces between the blocks, guide-pieces in the other alternate spaces, adjusting-pieces behind the knives and guide-pieces engaged by the heads of the adjusting-screws in the stationary blocks.

4. The combination with a cutter-head having shiftable cutters and cooperating elements, of a gage device removably insertible between the inner opposing edges of the cutters and cooperating elements, and a lower centering element for the said device.

5. The combination with a cutter-head having cutters and cooperating elements, of a plug-gage removably insertible through the head between the inner opposing edges of the said cutters and elements, and a plug-jig removably mounted in the lower end of the cutter to receive the lower extremity of the gage.

- In testimony whereof I affix my signature in presence of two witnesses.

COLUMBUS K. LASSITER.

\Vitnesses: I CHAS. S. HYER, JEssIE A. KING. 

